<template>
  <div class="app">
    <h3>我是App组件（祖）, {{ name }} --- {{ price }}</h3>
    <Child></Child>
  </div>
</template>

<script>
import {reactive, toRefs, provide} from 'vue'
import Child from './components/Child.vue'

  export default {
    name: 'App',
    components: {Child},
    setup(){
      let car = reactive({
        name: '奔驰',
        price: '40W'
      })
      provide('car', car) //给自己的后代组件传递数据

      return {
        ...toRefs(car)
      }
    }
  }
</script>

<style>
  .app {
    background-color: gray;
    padding: 10px;
  }
</style>